X-ray studies of microstructures in semiconductors and superconducting materials

Several different experimental investigations were carried out during the present report period. These include x-ray studies of semiconductors, high-Tc superconductors, and various thin films using synchrotron radiation (especially soft x-ray experiments by means of our new detector) and measurements of some fundamental properties of new superconducting materials made in our laboratory at Buffalo. We have made the first systematic study of electronic structure in the high-Tc superconductors La2-xSrxCuO4 with x ranging from 0 to 0.15 by x-ray absorption spectroscopy (XAS)